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author | 2018-05-13 19:52:33 -0400 | |
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committer | 2018-05-13 19:52:33 -0400 | |
commit | 62be291842be67be394942ca6ec8fa835dac858e (patch) | |
tree | 8ccd05b60ddb376c73008567794fa500fbbd5783 /3rdparty/softfloat3/source/f128_to_i64_r_minMag.c | |
parent | a65fccc1f54f4aba9324e97a26f919d5fa1a244b (diff) |
Initial import of SoftFloat release 3E [R. Belmont]
This is a pre-usage import so everyone can get things in line for various compilers. GCC/Clang should be OK on most targets as-is;
MSVC may need to edit 3rdparty/softfloat3/build/MAME/build.h to conform. Please report failure/success with various compilers.
Diffstat (limited to '3rdparty/softfloat3/source/f128_to_i64_r_minMag.c')
-rw-r--r-- | 3rdparty/softfloat3/source/f128_to_i64_r_minMag.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/3rdparty/softfloat3/source/f128_to_i64_r_minMag.c b/3rdparty/softfloat3/source/f128_to_i64_r_minMag.c new file mode 100644 index 00000000000..dc44e7ae216 --- /dev/null +++ b/3rdparty/softfloat3/source/f128_to_i64_r_minMag.c @@ -0,0 +1,113 @@ + +/*============================================================================ + +This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic +Package, Release 3e, by John R. Hauser. + +Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of +California. All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + + 1. Redistributions of source code must retain the above copyright notice, + this list of conditions, and the following disclaimer. + + 2. Redistributions in binary form must reproduce the above copyright notice, + this list of conditions, and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + 3. Neither the name of the University nor the names of its contributors may + be used to endorse or promote products derived from this software without + specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY +EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE +DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY +DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +=============================================================================*/ + +#include <stdbool.h> +#include <stdint.h> +#include "platform.h" +#include "internals.h" +#include "specialize.h" +#include "softfloat.h" + +int_fast64_t f128_to_i64_r_minMag( float128_t a, bool exact ) +{ + union ui128_f128 uA; + uint_fast64_t uiA64, uiA0; + bool sign; + int_fast32_t exp; + uint_fast64_t sig64, sig0; + int_fast32_t shiftDist; + int_fast8_t negShiftDist; + int_fast64_t absZ; + + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + uA.f = a; + uiA64 = uA.ui.v64; + uiA0 = uA.ui.v0; + sign = signF128UI64( uiA64 ); + exp = expF128UI64( uiA64 ); + sig64 = fracF128UI64( uiA64 ); + sig0 = uiA0; + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + shiftDist = 0x402F - exp; + if ( shiftDist < 0 ) { + /*-------------------------------------------------------------------- + *--------------------------------------------------------------------*/ + if ( shiftDist < -14 ) { + if ( + (uiA64 == UINT64_C( 0xC03E000000000000 )) + && (sig0 < UINT64_C( 0x0002000000000000 )) + ) { + if ( exact && sig0 ) { + softfloat_exceptionFlags |= softfloat_flag_inexact; + } + return -INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1; + } + softfloat_raiseFlags( softfloat_flag_invalid ); + return + (exp == 0x7FFF) && (sig64 | sig0) ? i64_fromNaN + : sign ? i64_fromNegOverflow : i64_fromPosOverflow; + } + /*-------------------------------------------------------------------- + *--------------------------------------------------------------------*/ + sig64 |= UINT64_C( 0x0001000000000000 ); + negShiftDist = -shiftDist; + absZ = sig64<<negShiftDist | sig0>>(shiftDist & 63); + if ( exact && (uint64_t) (sig0<<negShiftDist) ) { + softfloat_exceptionFlags |= softfloat_flag_inexact; + } + } else { + /*-------------------------------------------------------------------- + *--------------------------------------------------------------------*/ + if ( 49 <= shiftDist ) { + if ( exact && (exp | sig64 | sig0) ) { + softfloat_exceptionFlags |= softfloat_flag_inexact; + } + return 0; + } + /*-------------------------------------------------------------------- + *--------------------------------------------------------------------*/ + sig64 |= UINT64_C( 0x0001000000000000 ); + absZ = sig64>>shiftDist; + if ( exact && (sig0 || (absZ<<shiftDist != sig64)) ) { + softfloat_exceptionFlags |= softfloat_flag_inexact; + } + } + return sign ? -absZ : absZ; + +} + |